keystone: Remove redundant 'when'

In a multi-controller node, the presence of "run_once: True"
and "when: inventory_hostname == groups['keystone'][-1]"
will cause the task to be skipped

Closes-Bug: #1987982

Change-Id: I6a8f4ca285cda0675711b631aeed7ae4c992d879

ansible/roles/keystone/handlers/main.yml

@@ -96,4 +96,3 @@
   run_once: True
   when:
     - kolla_action == "upgrade"
-    - inventory_hostname == groups[service.group][-1]

ansible/roles/keystone/tasks/upgrade.yml

@@ -45,5 +45,4 @@
       value: 0
   run_once: True
   when:
-    - inventory_hostname == groups['keystone'][-1]
     - not use_preconfigured_databases | bool

releasenotes/notes/bug-1987982-fix-keystone-log_bin_trust_function_creators-variables-8628098891513dac.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed `bug #1987982  <https://bugs.launchpad.net/kolla-ansible/+bug/1987982>`_
+    This bug caused the database log_bin_trust_function_creators variable
+    not to be set back to "OFF" after a keystone upgrade.